The Mahou Sensei Negima OP Single - April - Happy☆Material CD was released in Japan on May 11, 2005 by KING RECORDS. This CD was released to go alongside with the TV series that aired the same year.
The CD features the anime's opening theme, Happy☆Material. This is the fourth release of six separate CD's, each performed by a set of the series' voice actresses. Aside from the singers, each CD offered a different version of the song itself and would release monthly between the months of January and June.
All songs were performed by the voice actresses Chiaki Omigawa, Megumi Takamoto, Mina Sakuma, Ryoko Shiraishi, and Misa Kobayashi the voices of Sakurako Shiina, Chao Lingshen, Mana Tatsumiya, Kaede Nagase, and Chizuru Naba respectively.
This CD also includes the failed-version Makie Pactio Card.